4.23×1.28+0.423×9.2 简便运算9.8×3.6+0.1×7.2 用递等式简便计算 跪求！！！
展开全部
4.23×1.28+0.423×9.2
=4.23×1.28+4.23×0.92
=4.23×(1.28+0.92)
=4.23×1.2
=4.23×1+4.23×0.2
=4.23+0.846
=5.076
9.8×3.6+0.1×7.2
=9.8×3.6+0.2×3.6
=3.6×(9.8+0.2)
=3.6×10
=36
=4.23×1.28+4.23×0.92
=4.23×(1.28+0.92)
=4.23×1.2
=4.23×1+4.23×0.2
=4.23+0.846
=5.076
9.8×3.6+0.1×7.2
=9.8×3.6+0.2×3.6
=3.6×(9.8+0.2)
=3.6×10
=36
追问
不好意思！~第一题我打错了，应该是4.23×1.08+0.423×9.2 请帮我重做一下 O(∩_∩)O谢谢！~
追答
4.23×1.08+0.423×9.2
=4.23×1.08+4.23×0.92
=4.23×(1.08+0.92)
=4.23×2
=4.23×2
=8.46
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